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Typc-B rcsponsc rcgulators (RRs) are transcription factors that function in the final step of two component signaling systems.In model plants, type-B RRs have been shown to play very important roles in cytokinin signal transduction.In Pyrus bretschneideri,cytokinin is effective in regulating pear development.However,information about the pear Type-B RRs (PpRR-B) family is limited.